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blue · cool

#36acff

a balanced, electric blue · cool · closest name: Deep Sky Blue

Token name suggestion: Atlas Harbour

RGB
54, 172, 255
HSL
205°, 100%, 61%
CMYK
79, 33, 0, 0
Luminance
0.3751

#36acff is a balanced electric blue, 205° on the wheel and 98/100 on the cool side. Put black text on it (8.50:1). As text it scores 2.47:1 on white — use #0079CF instead. Nearest name is Deep Sky Blue, nearest Tailwind family is sky.

hsl(205 100% 61%)rgb(54 172 255)Base step 500AAA inkCool

At a glance

Every number on this page in one read: what #36acff is made of, how bright it looks, and which way it leans.

Hex
#36acff
Hue
205°
blue
Saturation
100%
electric
Lightness
61%
balanced
Brightness
100%
HSV value
Perceived
63%
weighted brightness
Luminance
0.3751
WCAG relative
Temperature
Cool
98/100 cool
Color family
Blue
Tone
Electric
Best ink
Black
8.50:1
Closest name
Deep Sky Blue
ΔE2000 8.1
Chroma
50.4
LCH, 0–130ish
OKLCH L
0.718
perceptual lightness
Tailwind
sky
500 · ΔE 4.5
Web-safe
#3399FF
nearest of 216
Where it sits
Hue205° of 360°
Saturation100%
Lightness61%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #36acff.

Temperature
Warm ← → Cool98% cool

Reads cool. Warm and cool siblings keep the same lightness, so you can swap one in without redoing your contrast maths.

Luminance by channel
Red2%
Green79%
Blue19%

Green carries most of what the eye calls brightness — that is why WCAG weights it 0.7152.

Every format

HEX#36acff
HEX (8-digit)#36acffff
RGBrgb(54, 172, 255)
RGBArgba(54, 172, 255, 1)
HSLhsl(205, 100%, 61%)
HSV / HSBhsv(205, 79%, 100%)
HWBhwb(205 21% 0%)
CMYKcmyk(79%, 33%, 0%, 0%)
LABlab(67.7 -4.5 -50.2)
LCHlch(67.7 50.4 264.8)
OKLCHoklch(0.718 0.158 244.5)
XYZ (D65)xyz(34.32, 37.51, 100.02)
Decimal3583231
Display P3color(display-p3 0.212 0.675 1.000)
Web-safe#3399FF

Copy-ready code

every platformclick to select
/* CSS */
color: #36acff;
background-color: #36acff;
/* CSS custom property */
--brand: #36acff;
/* Tailwind (arbitrary) */
class="text-[#36acff] bg-[#36acff]"
/* SCSS */
$brand: #36acff;
/* SwiftUI */
Color(red: 0.212, green: 0.675, blue: 1.000)
/* UIKit */
UIColor(red: 0.212, green: 0.675, blue: 1.000, alpha: 1)
/* Android XML */
<color name="brand">#36ACFF</color>
/* Android Compose */
Color(0xFF36ACFF)
/* Flutter */
Color(0xFF36ACFF)
/* Python / OpenCV (BGR) */
(255, 172, 54)
/* Python / PIL (RGB) */
(54, 172, 255)
/* Java AWT */
new Color(54, 172, 255)
/* .NET */
Color.FromArgb(255, 54, 172, 255)
/* OpenGL / Unity (0–1) */
(0.2118f, 0.6745f, 1.0000f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{54,172,255}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #36acff 85%, white);
border-color: color-mix(in oklab, #36acff 40%, transparent);
/* theme-aware in one line */
color: light-dark(#004B80, #D3E3EE);
/* relative colour syntax */
--hover: hsl(from #36acff h s calc(l - 7));

Design tokens

The same ramp in the four formats a team actually needs. Paste one and the whole palette lands with it.

css custom propertiesclick to select
:root {
  --brand-50: #F1F8FE;
  --brand-100: #E3F2FC;
  --brand-200: #C0E3FC;
  --brand-300: #8FD1FF;
  --brand-400: #57B9FF;
  --brand-500: #36acff;
  --brand-600: #0090F5;
  --brand-700: #0078CC;
  --brand-800: #0060A3;
  --brand-900: #054776;
  --brand-950: #032C49;
  --brand: #36acff;
  --brand-ink: #000000;
  --brand-surface: #F4F8FA;
  --brand-border: #C0DAED;
  --brand-hover: #129DFF;
  --brand-pressed: #008BEE;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #141E24;
    --brand-ink: #D3E3EE;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#F1F8FE',
        100: '#E3F2FC',
        200: '#C0E3FC',
        300: '#8FD1FF',
        400: '#57B9FF',
        500: '#36acff',
        600: '#0090F5',
        700: '#0078CC',
        800: '#0060A3',
        900: '#054776',
        950: '#032C49',
        DEFAULT: '#36acff',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #F1F8FE,
  '100': #E3F2FC,
  '200': #C0E3FC,
  '300': #8FD1FF,
  '400': #57B9FF,
  '500': #36acff,
  '600': #0090F5,
  '700': #0078CC,
  '800': #0060A3,
  '900': #054776,
  '950': #032C49,
);
$brand-base: #36acff;
$brand-ink: #000000;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#F1F8FE", "$type": "color" },
      "100": { "$value": "#E3F2FC", "$type": "color" },
      "200": { "$value": "#C0E3FC", "$type": "color" },
      "300": { "$value": "#8FD1FF", "$type": "color" },
      "400": { "$value": "#57B9FF", "$type": "color" },
      "500": { "$value": "#36acff", "$type": "color" },
      "600": { "$value": "#0090F5", "$type": "color" },
      "700": { "$value": "#0078CC", "$type": "color" },
      "800": { "$value": "#0060A3", "$type": "color" },
      "900": { "$value": "#054776", "$type": "color" },
      "950": { "$value": "#032C49", "$type": "color" }
    },
    "brandInk": { "$value": "#000000", "$type": "color" }
  }
}

Best text color

Only one of black and white can be right. This is the one, with the number that proves it.

Readable at a glance#000000 on #36acff · 8.50:1
Use #000000AAA at every size.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 2.47:1
AA fail · AA large fail · AAA fail
Aa
Black text · 8.50:1 · recommended
AA pass · AA large pass · AAA pass
Reading the other direction: #36acff as text scores 2.47:1 on white and 8.50:1 on black.
Best tinted ink on it, if plain black or white feels flat: #004B80 at 3.67:1.

Make it accessible

A contrast checker tells you that you failed. This tells you what to ship instead — same hue, same saturation, lightness moved only as far as WCAG demands.

The quick fox
#0079CF · 4.53:1
AA on white−20% L
#0079CF
The quick fox
#005997 · 7.30:1
AAA on white−31% L
#005997
The quick fox
#36acff · 8.50:1
AA on blackalready passes
#36acff
The quick fox
#36acff · 8.50:1
AAA on blackalready passes
#36acff

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #0899FF is enough for headings on white. Non-text elements such as icons, chart strokes and focus rings also sit at 3:1 under WCAG 2.2 (1.4.11).

Accessibility — WCAG contrast

Aa
#36acff on white: 2.47:1
AA ✗ fail · AA-large · AAA
Aa
#36acff on black: 8.50:1
AA ✓ pass · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #36acff as text on that neutral, and that neutral as text on #36acff.

NeutralRatioBoth directions
White2.47:1AaAa
Slate 502.36:1AaAa
Slate 1002.25:1AaAa
Slate 2002.00:1AaAa
Slate 3001.66:1AaAa
Slate 4001.04:1AaAa
Slate 5001.93:1AaAa
Slate 6003.07:1AaAa
Slate 7004.19:1AaAa
Slate 8005.92:1AaAa
Slate 9007.23:1AaAa
Black8.50:1AaAa
Colour vision deficiency
true color
protanopia · #85AFFF
deuteranopia · #699DFD
tritanopia · #00C0CA

Roughly one man in twelve has some form of colour vision deficiency. If any of the three panels above is hard to tell apart from a neighbouring colour in your palette, add a shape, an icon or a label so the meaning does not rest on hue alone.

Color scale — 50 to 950

A Tailwind-shaped ramp built around this exact hex. #36acff is pinned to step 500; the rest hold its hue and let saturation ease off at the extremes so the pale end never turns neon.

#F1F8FE
#E3F2FC
#C0E3FC
#8FD1FF
#57B9FF
#36acff
#0090F5
#0078CC
#0060A3
#054776
#032C49
Base = 500Lightest = 50 · #F1F8FEDarkest = 950 · #032C49Text step on white = 700
Perceptual ramp — OKLCH

The same eleven steps expressed in OKLCH, where equal lightness numbers actually look equally spaced. HSL ramps go muddy in the yellows and washed out in the blues; this one does not. Modern browsers render it natively — the hex ramp above is the fallback.

50100200300400500600700800900950
oklch tokensclick to select
:root {
  --brand-50: oklch(0.97 0.040 244.5);
  --brand-100: oklch(0.94 0.063 244.5);
  --brand-200: oklch(0.88 0.095 244.5);
  --brand-300: oklch(0.80 0.123 244.5);
  --brand-400: oklch(0.72 0.145 244.5);
  --brand-500: oklch(0.64 0.158 244.5);
  --brand-600: oklch(0.56 0.158 244.5);
  --brand-700: oklch(0.48 0.149 244.5);
  --brand-800: oklch(0.40 0.133 244.5);
  --brand-900: oklch(0.32 0.111 244.5);
  --brand-950: oklch(0.24 0.087 244.5);
}

Colors that work with #36acff

Not a palette — a role sheet. Each swatch answers one question you will hit while building the component.

Text on it#000000
Black wins here
Surface#F4F8FA
Tinted page background
Border#C0DAED
Hairlines and dividers
Muted text#4B7A9B
Captions on the surface
Accent#CC2200
Second voice, not a rival
Dark variant#004B80
Hover, pressed, headers
Light variant#E5F4FF
Selected rows, tints
Dark surface#141E24
Dark-mode background
Hover#129DFF
One step down in lightness
Pressed#008BEE
Two steps down
Disabled#C9D4DC
Chroma pulled out
Focus ring#4AB4FF
Offset from the fill so it reads
Light mode
Everything in its place

Surface, border, heading and body all derive from this one hue, so the screen stays coherent without a second palette.

Primary actionSecondaryBadge
Dark mode
Same hue, inverted

Lightness flips, hue holds. The accent stays the anchor in both themes.

Primary actionSecondaryAccent

In real components

The same eight roles, wired into the interface patterns you will actually build with them. Every state below is a computed value, not a mock-up.

Buttons and states
Save changesHoverPressedDisabled
OutlineSubtleLinkFocused
Form field
you@company.com

Focus ring uses the light variant so the field still reads as one shape.

Send me product updates
Notice
Your export is ready

The file stays available for seven days. Download it before it expires.

NewBetaDraft
Data
Storage used68%
Acme LtdActive
NorthwindTrial
GlobexActive

How to use #36acff

Derived from its contrast, chroma and lightness — not from taste.

Works well for
  • Text and icons on dark surfaces
  • Primary buttons and calls to action
  • Focus rings, active and selected states
  • Brand accents, badges and data highlights
  • Chart series and data categories
Use with care
  • Text of any size on white — fails WCAG AA
  • Full-page backgrounds — tiring over long sessions
  • Pairing with a same-lightness hue — edges vibrate
Minimum size as text on white
Not as text
Safe as a fill behind white type
No — use #004B80
Safe as a 1px border on white
No — use #0899FF

Meaning and mood

What a colour in this family tends to signal, and how this particular chroma and lightness change the reading.

trustedcalmcompetentcorporate

The default of institutions for a reason: blue is read as stable and safe across nearly every culture that has been surveyed.

At this chroma the association is amplified — it will dominate anything placed beside it, so give it space and use it sparingly. The mid lightness keeps it versatile in both themes.

Worth knowing

It is also the most crowded hue on the web. Distinctiveness has to come from your other choices.

Reads as
  • FormalityLow
  • EnergyHigh
  • Weight39/100
  • TemperatureCool
  • ApproachabilityReserved

Colour associations are cultural and vary by market. Treat these as a starting point for a conversation with your audience, not a finding about them.

Similar colors

One move away from this hex in each direction. Every swatch is its own page.

Color relationships

The wheel positions with their names attached, so you can grab the one you actually need.

Complementary#FF8936
Analogous left#36FFEE
Analogous right#3647FF
Split-complement 1#FF3647
Split-complement 2#FFEE36
Triadic 1#FF36AC
Triadic 2#ACFF36
Tetradic#EE36FF
On the wheel
Base+30°−30°+120°+240°+180°205°

#36acff sits at 205°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red21.2%
Green67.5%
Blue100.0%
R · 0–255
54
0x36
G · 0–255
172
0xac
B · 0–255
255
0xff

CMYK percentages

Cyan78.8%
Magenta32.5%
Yellow0.0%
Key (black)0.0%

Total ink coverage is 111%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#36acff text on a black background

contrast 8.50:1

Card sample

#36acff text on a white background

contrast 2.47:1

Card sample

#36acff on grey

2.25:1

#36acff on its own surface

2.31:1

#36acff on its dark surface

6.85:1

CSS3 live lab

Text font color

The quick brown fox

color: #36acff;
Background color
Panel with #36acff background
background-color: #36acff;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #36acff;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(54, 172, 255, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(54, 172, 255, 0.45);
Border & gradient
Gradient panel
border: 3px solid #36acff;
background: linear-gradient(135deg, #36acff, #4636FF);
Gradient text

Gradient headline

background: linear-gradient(90deg, #36acff, #7836FF);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #36acff;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #36acff;
caret-color: #36acff;
Left rule
Pull quote or callout
border-left: 4px solid #36acff;
Ring + tint
Selected chip
background: #E5F4FF;
box-shadow: inset 0 0 0 2px #36acff;
Conic badge
68%
background: conic-gradient(#36acff 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #36acff over white; the bottom row is the same alpha over a checkerboard, so you can see what survives on a photo or a video.

Bottom row of hexes is the flattened result over white — use those when a design tool refuses transparency, or when you need a solid fallback.

alpha in every syntaxclick to select
rgba(54, 172, 255, 0.5)
rgb(54 172 255 / 50%)
#36acff80
hsl(205 100% 61% / 50%)
color-mix(in srgb, #36acff 50%, transparent)
Alpha8-digit hexFlat on white
10%#36acff1a#EBF7FF
20%#36acff33#D7EEFF
40%#36acff66#AFDEFF
60%#36acff99#86CDFF
80%#36acffcc#5EBDFF

Gradients from #36acff

Six recipes, each built from this hex and shown with the exact CSS that produced it.

Elevation
Same hue, three lightnesses — safe anywhere
background: linear-gradient(135deg, #73C5FF, #36acff 45%, #004B80);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #36acff, #3D17FF);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #36acff, #FF8936);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #92D2FF 0%, #36acff 45%, #004B80 100%);
Soft wash
Section backgrounds that stay readable
background: linear-gradient(180deg, #F4F8FA, #ffffff);
Mesh
Ambient background, no image weight
background: radial-gradient(60% 60% at 15% 20%, #69FFE6 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #5555FF 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #004B80 0%, transparent 65%), #36acff;

Monochromatic scale

Palettes built from #36acff

Shades — darker

Tints — lighter

Tones — desaturated

Color harmonies

Nearest named colors

Ranked with CIEDE2000 across all 139 CSS keywords. Under ΔE 2 the eye stops telling them apart; over ΔE 10 they are plainly different colors.

#36acff in the real world

Where a color in this family tends to land, and the interface roles it is usually asked to play.

Industries
TechnologyFinanceHealthcareEnterprise SaaS
Common UI roles
ButtonsLinksFocus statesCharts
Print note

Sits outside most CMYK gamuts — expect a duller press result, or specify a spot ink.

On screens

Holds up across typical panel gamma. Still worth checking on an uncalibrated laptop, where mid-tones shift most.

In dark mode

Usable as-is on a dark surface at 8.50:1.

Explore nearby colors

Small, deliberate steps away from this hex — useful when you are hunting for the version of a colour that finally feels right.

#36acff, answered

What color is #36acff?

#36acff is a balanced electric blue, closest to Deep Sky Blue (ΔE2000 8.1). It sits at 205° on the hue wheel with 100% saturation and 61% lightness, which reads as cool.

What is the RGB value of #36acff?

rgb(54, 172, 255) — 54 red, 172 green and 255 blue out of 255, or 21.2% / 67.5% / 100% by channel.

What is #36acff in HSL and HSV?

hsl(205, 100%, 61%) and hsv(205, 79%, 100%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #36acff a light or a dark color?

It is a mid-tone. Relative luminance is 0.3751 and perceived brightness is 63%, so black text on it reaches 8.50:1.

Should I use black or white text on #36acff?

Black. It scores 8.50:1 against #36acff, versus 2.47:1 for white — AAA at any size.

Is #36acff accessible on a white background?

#36acff on white scores 2.47:1, which fails WCAG AA at every size. Darken it to #0079CF to reach 4.5:1, or #005997 for 7:1.

What is the complementary color of #36acff?

#FF8936 sits directly opposite on the wheel. Softer options are the split-complements #FF3647 and #FFEE36, which give the same contrast with far less vibration.

What colors go well with #36acff?

For interface work: #F4F8FA as the surface, #C0DAED for borders, #4B7A9B for secondary text, #CC2200 as an accent and #004B80 for hover and pressed states. For a palette, the analogous pair #36FFEE and #3647FF stays calm, while #FF8936 is the loudest partner.

What is #36acff in CMYK for printing?

cmyk(79%, 33%, 0%, 0%). This is a screen-to-ink approximation — a color this saturated sits outside most CMYK gamuts and will print duller than it looks here.

Is #36acff warm or cool?

Cool — it scores 98 on a scale where 0 is the warmest orange and 100 the coolest azure. Nudged warmer it becomes #36F6FF; nudged cooler, #1D95FF.

Which Tailwind color is closest to #36acff?

The sky family — its 500 step is #0ea5e9, ΔE2000 4.5 away. That is a visible difference, so define #36acff as a custom token rather than reaching for the built-in.

How do I use #36acff in Tailwind CSS?

Inline it as an arbitrary value with bg-[#36acff] or text-[#36acff], or register the whole ramp under theme.extend.colors.brand so you get bg-brand-500 and friends. The generated 50–950 scale on this page is ready to paste into your config.

What is #36acff with 50% opacity?

rgba(54, 172, 255, 0.5), or #36acff80 in eight-digit hex. Over white that composites to #9BD6FF; over black, #1B5680.

Is #36acff a web-safe color?

No. The nearest web-safe colour is #3399FF, ΔE2000 6.5 away. The palette only matters for legacy displays and some email clients now.

What does the color #36acff mean?

As a blue, it reads trusted, calm, competent. The default of institutions for a reason: blue is read as stable and safe across nearly every culture that has been surveyed. At this chroma the effect is amplified — it will dominate whatever sits beside it.

What gradient works with #36acff?

The safest is same-hue elevation: linear-gradient(135deg, #73C5FF, #36acff 45%, #004B80). For more colour, a short hue run to #3D17FF keeps it rich without turning muddy.

Work with #36acff in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #36acff at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.